Drill Press Table Modification-------E Z Clampable drill press table

[Paul Alciatore]

They are called Tee Nuts or, more properly, Tee Slot Nuts:

https://www.bing.com/search?q=Tee+Nu...ZI&form=MOZLBR

https://www.mcmaster.com/#tee-nuts/=1aqu7s5

Not the sheet metal ones that are made for wood. But the ones that are machined from solid steel. They come in many sizes and you need to buy some that fit your table's slots. Then you can locate a stud at any place along the slot. They work with Tee slots that are found on the better tables and also with just plain through slots as found on the less expensive DP tables.

You can buy complete clamping sets, also in different sizes:

https://www.mcmaster.com/#t-bolt-clamps/=1aqu8z6

Or just buy the nuts and studs and use your own clamps.